687475320 has 128 divisors (see below), whose sum is σ = 2371991040. Its totient is φ = 156142080.

The previous prime is 687475319. The next prime is 687475333. The reversal of 687475320 is 23574786.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134410 + ... + 139430.

It is an arithmetic number, because the mean of its divisors is an integer number (18531180).

Almost surely, 2^687475320 is an apocalyptic number.

687475320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687475320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185995520).

687475320 is an abundant number, since it is smaller than the sum of its proper divisors (1684515720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687475320 is a wasteful number, since it uses less digits than its factorization.

687475320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205 (or 5201 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 687475320 is about 26219.7505708960. The cubic root of 687475320 is about 882.5765226146.

The spelling of 687475320 in words is "six hundred eighty-seven million, four hundred seventy-five thousand, three hundred twenty".